问题描述
有没有被定义为一个64位版本的一个简单的preprocessor宏？我以为 _WIN64 也许是吧，但即使当我建立一个32位的目标，包含在的#ifdef _WIN64 ...＃零件ENDIF 被编译，而这导致的问题。今天是周五，我无法想通，但我敢肯定，我俯瞰这里的东西很简单。甚至一些涉及的sizeof 。
Is there a simple preprocessor macro that is defined for a 64-bit build? I thought _WIN64 might have been it, but even when I build a 32-bit target, the parts enclosed in a #ifdef _WIN64 ... #endif are compiled in, and this is causing problems. It's Friday and I can't think straight, but I'm sure I'm overlooking something very simple here. Maybe even something involving sizeof.
推荐答案
我一直使用_WIN64来检查它是否是一个64位版本。
I have always used _WIN64 to check if it is a 64 bit build.
N.B。 _WIN32也总是（自动）由MSVC在64位定义的版本，所以检查_WIN64您检查_WIN32之前：
N.B. _WIN32 is also always (automatically) defined by MSVC in 64 bit builds, so check for _WIN64 before you check for _WIN32:
#if defined( _WIN64 )
// Windows 64 bit code here
#elif defined( _WIN32 )
// Windows 32 bit code here
#else
// Non-Windows code here
#endif
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